Print start: contact homing, nozzle guard, Z check, purge before chamber heat
- HOME always homes Z with Beacon contact and recalibrates, also when the printer is already homed (home_method_when_homed = proximity used the model of an earlier print without touching the bed). PRINT_START homes Z again after QGL, before the brush takes the nozzle below Z0. - _Z_CHECK: after the soak, compare Klipper's Z with a BEACON_QUERY reading at Z3 over the bed centre and stop the print above 1 mm. Warns and continues when BEACON_QUERY leaves no new printer.beacon.last_sample. - Nozzle guard (extras/bdp_guard.py, print/nozzle_guard.cfg): reads the bd_pressure force over I2C every 20 ms while armed and, in stop mode, shuts Klipper down on a touch. Armed for HOME X/Y, QGL, Z homing, brush, mesh and the Z check; starts in log mode to collect peaks per phase. - Chamber prints: load and purge the first tool before the chamber heats (_LOAD_FOR_CHAMBER replaces _UNLOAD_FOR_CHAMBER). A cut unload leaves a piece of PLA in the extruder that softened in the hot chamber and jammed the ASA load. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@@ -9,10 +9,13 @@
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# PRINT_START runs on a soaked bed:
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# PRINT_WARMUP bed heats while the nozzle cools and the printer homes,
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# wait for the bed, HEAT_SOAK
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# PRINT_START QGL, contact Z calibration, mesh, load the initial tool,
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# PRINT_START QGL, Z, contact Z calibration, mesh, load the initial tool,
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# PA for all lanes, XY reference
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# The filament is loaded after the Z calibration, so the contact always
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# touches a clean nozzle that has not been oozing at 150C for minutes.
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# Chamber prints are the exception: PRINT_WARMUP loads and purges the first
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# tool before the chamber heats (_LOAD_FOR_CHAMBER), retracted for the soak;
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# BLOBIFIER_CLEAN cleans the nozzle before the contact.
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[gcode_macro PRINT_WARMUP]
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description: Print start before HEAT_SOAK: home while the bed heats, wait for the bed, soak
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@@ -50,9 +53,11 @@ gcode:
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RESPOND MSG="homing"
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HOME
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{% if target_chamber > 30 %}
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_UNLOAD_FOR_CHAMBER TOOL={initial_tool}
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_LOAD_FOR_CHAMBER TOOL={initial_tool}
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{% endif %}
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_GUARD_ON PHASE=warmup_park
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G1 X175 Y175 Z5 F1200
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_GUARD_OFF
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_STATUS STATE=heating_bed
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{% if target_bed > 0 %}
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@@ -71,35 +76,56 @@ gcode:
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HEAT_SOAK HEATER='heater_bed' TARGET={target_bed} SOAKER='temperature_sensor bed_core' SOAK_TEMP={target_bed - 5} TIMEOUT=30 CANCEL='_NOTHING'
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{% endif %}
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# With the chamber heated, a filament that stays in the toolhead path softens
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# in the PTFE tube (PLA loaded, ASA print). PRINT_START would swap a lane that
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# is not the first tool's anyway, so unload it now, before the chamber heats.
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# AFC moves the filament back into the Box Turtle, outside the chamber.
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[gcode_macro _UNLOAD_FOR_CHAMBER]
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description: Before a chamber soak: unload the toolhead when its lane is not mapped to TOOL (the print's first tool)
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# With the chamber heated, filament in the toolhead path softens: a PLA lane
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# still loaded softens in the PTFE tube, and the piece of PLA that a cut
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# unload leaves below the cutter softens in the extruder and jams the next
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# load (seen: PLA unloaded, ASA jammed after the soak). The piece stays until
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# the next load, so an empty toolhead can have it too. For a chamber print,
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# load the print's first tool and purge it now, before the chamber heats:
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# the purge at the new filament's temperature pushes the leftover out.
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# AFC unloads a loaded lane back into the Box Turtle, outside the chamber.
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[gcode_macro _LOAD_FOR_CHAMBER]
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description: Before a chamber soak: load and purge TOOL (the print's first tool) unless its lane is already loaded
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gcode:
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{% set tool = 'T' ~ params.TOOL|default(0)|int %}
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{% set cur = printer.AFC.current_load if 'AFC' in printer else none %}
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{% if cur and ('AFC_stepper ' ~ cur) in printer %}
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{% set lane = printer['AFC_stepper ' ~ cur] %}
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{% if lane.map != tool %}
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RESPOND MSG="Chamber heating: unloading {cur} ({lane.material}, {lane.map}), the print starts with {tool}"
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_HEAT_FOR_LOADED_LANE TOOL={params.TOOL|default(0)|int}
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TOOL_UNLOAD LANE={cur}
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_UNLOAD_FOR_CHAMBER_VERIFY LANE={cur}
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{% if 'AFC' in printer %}
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{% set cur = printer.AFC.current_load %}
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{% set ns = namespace(lane=none) %}
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{% for l in printer.AFC.lanes if ('AFC_stepper ' ~ l) in printer and printer['AFC_stepper ' ~ l].map == tool %}
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{% set ns.lane = l %}
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{% endfor %}
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{% if ns.lane is none %}
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_ERROR MSG="Chamber heating: no AFC lane is mapped to {tool}, print stopped before the chamber heats" DISPLAY="No lane for {tool}, print stopped"
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{% elif cur != ns.lane %}
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{% set new = printer['AFC_stepper ' ~ ns.lane] %}
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# Hot enough to unload the old filament and to purge the new one
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{% set temps = [new.extruder_temp|default(0, true)|int, printer.configfile.settings.extruder.min_extrude_temp|int + 20] %}
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{% if cur and ('AFC_stepper ' ~ cur) in printer %}
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{% set temps = temps + [printer['AFC_stepper ' ~ cur].extruder_temp|default(0, true)|int] %}
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RESPOND MSG="Chamber heating: unloading {cur} ({printer['AFC_stepper ' ~ cur].material}), loading and purging {ns.lane} ({new.material}, {tool}) before the chamber heats"
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{% else %}
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RESPOND MSG="Chamber heating: loading and purging {ns.lane} ({new.material}, {tool}) before the chamber heats"
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{% endif %}
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M109 S{temps|max}
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{tool}
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_LOAD_FOR_CHAMBER_VERIFY LANE={ns.lane}
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{% endif %}
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{% endif %}
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# Separate macro: rendered after TOOL_UNLOAD has run. A failed unload stops
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# the print before the chamber heats.
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[gcode_macro _UNLOAD_FOR_CHAMBER_VERIFY]
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description: Helper for _UNLOAD_FOR_CHAMBER: stop the print when the lane is still loaded
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# Separate macro: rendered after the tool change has run. AFC pauses on a
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# failed load instead of raising an error, so check the result here: a
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# failed load stops the print before the chamber heats.
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[gcode_macro _LOAD_FOR_CHAMBER_VERIFY]
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description: Helper for _LOAD_FOR_CHAMBER: stop the print when LANE is not loaded, else retract and cool the nozzle for the soak
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gcode:
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{% if printer.AFC.current_load %}
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_ERROR MSG="Chamber heating: {params.LANE} could not be unloaded ({printer.AFC.current_load} still in the toolhead), print stopped before the chamber heats" DISPLAY="Unload failed, print stopped"
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{% if printer.AFC.current_load != params.LANE %}
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_ERROR MSG="Chamber heating: {params.LANE} could not be loaded ({printer.AFC.current_load or 'nothing'} in the toolhead), print stopped before the chamber heats" DISPLAY="Load failed, print stopped"
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{% else %}
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# The filament the retract was remembered for is gone
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# New filament, just purged: a retract remembered for the old one is
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# gone. Retract so it does not ooze during the soak; PRINT_START
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# undoes it over the bucket.
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SAVE_VARIABLE VARIABLE=nozzle_retract VALUE=0
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_NOZZLE_RETRACT
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M104 S150
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{% endif %}
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@@ -150,19 +176,37 @@ gcode:
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_LIGHTS_ON
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M106 S0
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# The last homing was before the soak: check that Z still matches the
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# Beacon before the gantry goes low. MAX=1.0: the soak itself drifts Z
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# a few tenths; the console line shows how much.
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_Z_CHECK MAX=1.0
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# The bed is soaked now: level and calibrate Z on the final geometry
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_STATUS STATE=leveling
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RESPOND MSG="quad gantry level"
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# Nozzle guard (bd_pressure) on while nothing should touch the nozzle
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_GUARD_ON PHASE=qgl
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QUAD_GANTRY_LEVEL
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# QGL moved the Z steppers and the frame drifted during the soak: home Z
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# again (proximity, on the model of the contact homing in PRINT_WARMUP)
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# before the brush takes the nozzle below Z0
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_GUARD_ON PHASE=z_home
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G28 Z
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# Own phase: the bristles press on the nozzle too
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_GUARD_ON PHASE=brush
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BLOBIFIER_CLEAN
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_GUARD_OFF
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_STATUS STATE=calibrating_z
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_NOZZLE_CONTACT_TEMP WAIT=1
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G28 Z METHOD=CONTACT CALIBRATE=1 ; calibrate z offset and beacon model hot
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_STATUS STATE=meshing
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RESPOND MSG="meshing"
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_GUARD_ON PHASE=mesh
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BED_MESH_CALIBRATE RUNS=2 ; bed mesh in scan mode
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# From here on the nozzle extrudes and AFC cuts and loads: guard off
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_GUARD_OFF
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# Heat over the bucket, then undo the retracts of the previous PRINT_END
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_STATUS STATE=heating_extruder
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@@ -232,8 +276,9 @@ gcode:
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# End-of-print cleanup shared by PRINT_END and CANCEL_PRINT
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[gcode_macro _PRINT_CLEANUP]
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description: Heaters (incl. chamber heater) and part fan off, flow back to 100%, bdwidth off, mesh and skew cleared
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description: Heaters (incl. chamber heater) and part fan off, flow back to 100%, bdwidth off, mesh and skew cleared, nozzle guard off
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gcode:
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_GUARD_OFF ; a print start that failed while it was armed
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TURN_OFF_HEATERS
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iHEATER_OFF ; stops the chamber heater control loop too
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M107
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